Baffle for water-tube boilers



June 1927' D. H. MAYO BAFFLE FOR WATER TUBE BOILERS Filed Julys. 1925 3 Sheets-Shut, l

5/ a mmvron 44/402 ATTORNEY 2 #1927. June D. H. MAYO BAFFLE FOR WATER TUBE BOILERS Filed JuLvZ. 1925 3 Sheets- Sheet 2 4 a 1 4 ,INVENTOR;

ATTORNEY D. H. MAYO BAFFLE FOR WATER TUBE BOILERS Filed Ju1y5, 1925 s sheets-sheet 3 June 28, 1927.

M IN V EN TOR.

4.16066 4. 3 W v A (MM) Patented June 28, 1927.

DANA H. MAYO, DETROIT, MICHIGAN.

BAFFLE FOR WATER-TUBE BOILERS.

Application filed July 3, 1925.

construction for use in water tube boiler in stallation. Its object is to provide means for varying the circulation area or space in the course of the gases of combustion, in proportion to the draft or pressure, by means of an adjustable baffle wall, as shown in the drawings and hereinafter described.

' In the drawings showing certain preferred embodiments of the invention:

Figure 1 is a view in sectional elevation showing one form of the battle in operative position with relation to a bank of tubes.

Figure 2 is a partial sectional View in front elevation.

Figure 3 is an enlarged sectional detail view showing the link connection between adjacent plate sections of a flexible baflle wall, both straight and deflected.

Figures i and 5 are additional detail views in face and edge views respectively, showing a modified construction.

Figure 6 is a partial View similar to Fig. 1, showing a further modified arrangement, utilizing a battle member of the. valve or damper type.

In the construction and operation of a typical installation of a water tube boiler of the inclined type. the banks of tubes 2 connecting the usual mud drum 3 with a steam or other upper drum 4, are usually provided with baflies laid across the tubes at varying positions and heights with alternating circulation spaces attop and bottom, to eflect tortuous travel of the gases towards the stack.

Ordinarily such baflie walls, of refractory or other suitable material, are fixed and inflexible, and not subject to change under varying conditions of operation of the boiler as to draft, pressure, etc.

In my present invention I have shown one side of the bank of tubes 2 provided for a considerable distance above the mud drum 3 with a layer of plate metal or other baflie 5, over the top of which is a space for gas circulation downwardly. Spaced beyond baffle 5 sufficiently to provide intervening area for downgoing gases, is a similar battle 6, closing off circulation below upper drum 4 towards the bottom.

The feature of improvement involved in the present invention is a flexible apron or adjustable damper valve extending below the lower edge of fixed bafie 6, capable of being lengthened and shortened or otherwise ad- Serial No. 41,373.

justedto vary the lower circulation space or gas circulation area above the lower drum 3.

Said apron, as in Figs. 1 to 5 inclusive, is composed of a series of steel plate slat sections 7 connected together an-dto each other by loosely arranged links 8, as shown.

The lowermost slat is provided with any suitable terminal connection, as an angle bracket 9, to which raising and lowering wires or cables 10 are connected, so that the baffle may be lengthened or shortened by winding the cables upon sheave wheels 11, to which they are connected at their upper ends.

The apron is preferably composed of a series of such connected sections arranged end to end across the face of the bank of tubes, as in Fig. 2 with a corresponding sheave wheel 11 for each sectional series. l/Vheels 11 are mounted on a rotatable shaft 12, carried in bearings 13 at intervals, and spaced conveniently as determined by the tubes or other conditions, Shaft 12 may be made of pipe sections with a central square or other bar 14, having at its outer end a worm wheel or other suitable gear 15in driving engagement with a worm 16 or the like.

I Bearings 13 are supported across the space provided for the looped apron by fixed connection with opposite tubes, asat 17. Ad ditional bracing supports 18 are connected with the several crossbearing supports as at 19, and at the top'with holding brackets 20 secured to the upper end portions of the tubes, as in Fig. 1., By this means the sheaves and shaft are rotatably mounted in their bearings, and are capable of being turned for winding or unwinding to any desired extent.

lugs 22 and 24 with connecting pins or bolts 23. as in Figs. 4; and 5. In either case the baffle Walls are sufficiently flexible to allow of their assuming a looped or return bend form, as in Fig. 1, somewhat in the manner of a drop curtain.

In Figure 6 I show a further modified construction in which a hinged butterfly valve or damper 26 is pivotally connected to additional the lower edge of the stationary bafile sec tion 6, as at 27. It is raised or lowered to the desired extent by cables in the same manner as above described, as indicated in dotted lines.

It will be obvious also that other forms of adjustable bafiie sections may be substituted,

as in the form of a sliding damper, and thatthe construction may be otherwise changed or varied by the skilled mechanic within the scope of the following claims.

I claim: I

1. A water tube boiler provided with an adjustable baffle composed of an upper immovable portion and a lower'movable portion forming a positively connected extension thereof, said movable portion being adapted to be raised and lowered towards and from the immovable portion to vary the gas circulation area.

2. A battle wall for water tube boilers consisting of a flexible apron continuously connected with and depending below an upper fixed portion, and means for raising and lowering the lower portion of the apron.

3. A baffle wall for water tube boilers consisting of a flexible apron composed of loosely connected sections, and means for raising and lowering its lower portion only.

4:. A battle wall for water tube boilers consisting of a flexible apron fixedly secured by its upper edge, and means for raising and lowering its lower edge portion.

5. A baffie wall for water tube boilers consisting of a flexible apron fixedly secured by its upper edge, and raising and lowering mechanism connected to its lower edge adapted to vary the depth of the apron by folding it upwardly or downwardly.

6. In a water tube boiler, an adjustable baffle wall consisting of a continuous series of flexibly connected cross slats secured at the top and connected at the bottom to lifting mechanism for lengthening or shortening the lower portion of the wall.

7. In a water tube boiler, an adjustable bafilewall consisting of a continuous series of flexibly connected cross slats secured at the top across a bank of tubes, a sheave wheel and means for rotating it, and a flexible connection between the sheave wheel and the lower edge of the baffle wall.

8. In a water tube boiler, in combination with a bank of tubes having an upper fixed batlie wall, an adjustable extension forming a positively connected continuation thereof depending below the fixed wall, and means for raising or lowering it.

9. In a water tube boiler, in combination with a bank of tubes having an upper fixed baffle wall, a flexible extension thereof de pending below the fixed wall, and means for raising or lowering its lower edge.

10. In a water tube boiler, in combination with a bank of tubes having an upper fixed bafile wall, a flexible extension thereof depending below the fixed wall, adapted to be turned upwardly at its lower edge portion, an upper transverse shaft having sheave wheels thereon, flexible connections between the sheave wheels and the lower edge of the flexible extension, and means for actuating the shaft.

11. A battle wall for water tube boilers consisting of a series of metal plates having pivotally connected hinge lugs at one side thereof providing for abutting engagement and limited flexure of the plates, and means for reversing the lower portion of the wall and lifting it upwardly to shorten the effective length of the wall.

12. A baflie wall for water tube boilers consisting of a series of metal plates having pivotally connected hinge lugs at one side thereof providing for abutting engagement and limited fiexure of the plates at their hinged joints, and means for reversing the, lower portion of the wall and lifting it upwardly to shorten the effective length of the wall and for alternately lowering it to lengthen the wall.

In testimony whereof I hereunto affix my signature.

DANA H. MAYO. 

